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Major Description
I was able to set coprocessors for table by shell normally, but it didn't worked now.
Here's the shell output (omit really jar path and coprocessor classname)：
HBase Shell; enter 'help<RETURN>' for list of supported commands. Type "exit<RETURN>" to leave the HBase Shell Version 1.3.0-SNAPSHOT, 642273bc2a5a415eba6f1592a439a6b2b53a70a9, Tue Sep 29 15:58:28 CST 2015 hbase(main):001:0> describe 'test' Table test is ENABLED test COLUMN FAMILIES DESCRIPTION {NAME => 'f', DATA_BLOCK_ENCODING => 'NONE', BLOOMFILTER => 'ROW', REPLICATION_SCOPE => '0', VERSIONS => '1', COMPRESSION => 'NONE', MIN_VERSIONS => '0', TTL => 'FOREVER', KEEP_DELETED_CELLS => 'FALSE', B LOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'} 1 row(s) in 0.4370 seconds hbase(main):002:0> alter 'test', 'coprocessor'=>'hdfs:///some.jar|com.somepackage.SomeObserver|1001' Updating all regions with the new schema... 1/1 regions updated. Done. 0 row(s) in 1.9760 seconds hbase(main):003:0> describe 'test' Table test is ENABLED test, {TABLE_ATTRIBUTES => {coprocessor$1 => '|hdfs:///some.jar|com.somepackage.SomeObserver|1001|1073741823|'} COLUMN FAMILIES DESCRIPTION {NAME => 'f', DATA_BLOCK_ENCODING => 'NONE', BLOOMFILTER => 'ROW', REPLICATION_SCOPE => '0', VERSIONS => '1', COMPRESSION => 'NONE', MIN_VERSIONS => '0', TTL => 'FOREVER', KEEP_DELETED_CELLS => 'FALSE', B LOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'} 1 row(s) in 0.0180 seconds
I checked the recent commits and found HBASE-14224 is related to. It's an important improvement, but made a mistake in alter() of admin.rb, line 587. As the value is coprocess spec string but not only class name, here should use htd.setCoprocessorWithSpec instead of htd.setCoprocessor.